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;;; ob-picolisp.el --- org-babel functions for picolisp evaluation
;; Copyright (C) 2010-2015 Free Software Foundation, Inc.
;; Authors: Thorsten Jolitz
;; Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage:
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <>.
;;; Commentary:
;; This library enables the use of PicoLisp in the multi-language
;; programming framework Org-Babel. PicoLisp is a minimal yet
;; fascinating lisp dialect and a highly productive application
;; framework for web-based client-server applications on top of
;; object-oriented databases. A good way to learn PicoLisp is to first
;; read Paul Grahams essay "The hundred year language"
;; ( and then study the various
;; documents and essays published in the PicoLisp wiki
;; ( PicoLisp is included in some
;; GNU/Linux Distributions, and can be downloaded here:
;; It ships with a picolisp-mode and
;; a inferior-picolisp-mode for Emacs (to be found in the /lib/el/
;; directory).
;; Although it might seem more natural to use Emacs Lisp for most
;; Lisp-based programming tasks inside Org-Mode, an Emacs library
;; written in Emacs Lisp, PicoLisp has at least two outstanding
;; features that make it a valuable addition to Org-Babel:
;; PicoLisp _is_ an object-oriented database with a Prolog-based query
;; language implemented in PicoLisp (Pilog). Database objects are
;; first-class members of the language.
;; PicoLisp is an extremely productive framework for the development
;; of interactive web-applications (on top of a database).
;;; Requirements:
;;; Code:
(require 'ob)
(require 'comint)
(eval-when-compile (require 'cl))
(declare-function run-picolisp "ext:inferior-picolisp" (cmd))
(defvar org-babel-tangle-lang-exts) ;; Autoloaded
;; optionally define a file extension for this language
(add-to-list 'org-babel-tangle-lang-exts '("picolisp" . "l"))
;;; interferes with settings in org-babel buffer?
;; optionally declare default header arguments for this language
;; (defvar org-babel-default-header-args:picolisp
;; '((:colnames . "no"))
;; "Default arguments for evaluating a picolisp source block.")
(defvar org-babel-picolisp-eoe "org-babel-picolisp-eoe"
"String to indicate that evaluation has completed.")
(defcustom org-babel-picolisp-cmd "pil"
"Name of command used to evaluate picolisp blocks."
:group 'org-babel
:version "24.1"
:type 'string)
(defun org-babel-expand-body:picolisp (body params)
"Expand BODY according to PARAMS, return the expanded body."
(let ((vars (mapcar #'cdr (org-babel-get-header params :var)))
(result-params (cdr (assoc :result-params params)))
(print-level nil) (print-length nil))
(if (> (length vars) 0)
(concat "(prog (let ("
(lambda (var)
(format "%S '%S)"
(print (car var))
(print (cdr var))))
vars "\n ")
" \n" body ") )")
(defun org-babel-execute:picolisp (body params)
"Execute a block of Picolisp code with org-babel. This function is
called by `org-babel-execute-src-block'"
(message "executing Picolisp source code block")
(let* (
;; Name of the session or "none".
(session-name (cdr (assoc :session params)))
;; Set the session if the session variable is non-nil.
(session (org-babel-picolisp-initiate-session session-name))
;; Either OUTPUT or VALUE which should behave as described above.
(result-type (cdr (assoc :result-type params)))
(result-params (cdr (assoc :result-params params)))
;; Expand the body with `org-babel-expand-body:picolisp'.
(full-body (org-babel-expand-body:picolisp body params))
;; Wrap body appropriately for the type of evaluation and results.
((or (member "code" result-params)
(member "pp" result-params))
(format "(pretty (out \"/dev/null\" %s))" full-body))
((and (member "value" result-params) (not session))
(format "(print (out \"/dev/null\" %s))" full-body))
((member "value" result-params)
(format "(out \"/dev/null\" %s)" full-body))
(t full-body)))
(if (not (string= session-name "none"))
;; Session based evaluation.
(mapconcat ;; <- joins the list back into a single string
(butlast ;; <- remove the org-babel-picolisp-eoe line
(delq nil
(lambda (line)
(org-babel-chomp ;; Remove trailing newlines.
(when (> (length line) 0) ;; Remove empty lines.
;; Remove leading "-> " from return values.
((and (>= (length line) 3)
(string= "-> " (substring line 0 3)))
(substring line 3))
;; Remove trailing "-> <<return-value>>" on the
;; last line of output.
((and (member "output" result-params)
(string-match-p "->" line))
(substring line 0 (string-match "->" line)))
(t line)
;;(if (and (>= (length line) 3);Remove leading "<-"
;; (string= "-> " (substring line 0 3)))
;; (substring line 3)
;; line)
;; Returns a list of the output of each evaluated exp.
(session org-babel-picolisp-eoe)
(insert wrapped-body) (comint-send-input)
(insert "'" org-babel-picolisp-eoe)
;; external evaluation
(let ((script-file (org-babel-temp-file "picolisp-script-")))
(with-temp-file script-file
(insert (concat wrapped-body "(bye)")))
(format "%s %s"
(org-babel-process-file-name script-file))
(org-babel-result-cond result-params
(read result))))
(defun org-babel-picolisp-initiate-session (&optional session-name)
"If there is not a current inferior-process-buffer in SESSION
then create. Return the initialized session."
(unless (string= session-name "none")
(require 'inferior-picolisp)
;; provide a reasonable default session name
(let ((session (or session-name "*inferior-picolisp*")))
;; check if we already have a live session by this name
(if (org-babel-comint-buffer-livep session)
(get-buffer session)
(run-picolisp org-babel-picolisp-cmd)
(rename-buffer session-name)
(provide 'ob-picolisp)
;;; ob-picolisp.el ends here
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